Exalted (Whenever a creature you control attacks alone, that creature gets +1/+1 until end of turn.)
Whenever a creature you control attacks alone, you may search your library for an Aura card that could enchant that creature, put it onto the battlefield attached to that creature, then shuffle your library.

, , Discard a card: Create a 3/1 red Elemental creature token named Spark Elemental. It has trample, haste, and "At the beginning of the end step, sacrifice Spark Elemental."

Create a 1/2 green Spider creature token with reach for each creature card in your graveyard.
Flashback (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Enchant creature
Enchanted creature gets +1/+1 and has reach. (It can block creatures with flying.)
Totem armor (If enchanted creature would be destroyed, instead remove all damage from it and destroy this Aura.)

Whenever a player discards a card, you may pay . If you do, create a 1/1 white Spirit creature token with flying.

Choose a card name. Reveal cards from the top of your library until you reveal a card with that name, then put that card into your hand. Exile all other cards revealed this way, and you lose 1 life for each of the exiled cards.

At the beginning of your upkeep, you may return Squee, Goblin Nabob from your graveyard to your hand.

Heroic — Whenever you cast a spell that targets Staunch-Hearted Warrior, put two +1/+1 counters on Staunch-Hearted Warrior.

Reach
When Stingerfling Spider enters the battlefield, you may destroy target creature with flying.

Stirring Wildwood enters the battlefield tapped.
: Add or .
: Until end of turn, Stirring Wildwood becomes a 3/4 green and white Elemental creature with reach. It's still a land.

As an additional cost to cast this spell, exile a creature card from your graveyard.
Flying

, : Create a 2/2 blue Homunculus creature token, then sacrifice a creature.

Target player shuffles up to four target cards from their graveyard into their library.

Flying
Exalted (Whenever a creature you control attacks alone, that creature gets +1/+1 until end of turn.)
Other creatures you control have exalted. (If a creature has multiple instances of exalted, each triggers separately.)

When Sultai Skullkeeper enters the battlefield, mill two cards.

Spell mastery — If there are two or more instant and/or sorcery cards in your graveyard, you may cast Swift Reckoning as though it had flash. (You may cast it any time you could cast an instant.)
Destroy target tapped creature.

Whenever you cast an instant or sorcery spell, create a 2/2 blue Drake creature token with flying.

Tarmogoyf's power is equal to the number of card types among cards in all graveyards and its toughness is equal to that number plus 1.

Delve (Each card you exile from your graveyard while casting this spell pays for .)
: Mill two cards, then return a nonland card of an opponent's choice from your graveyard to your hand.

Take an extra turn after this one.